Spring nut-lock washer



Dec. 30, 1930. Y H G, NORWOOD ,786,502

SPRIN- NUT LOCK WASHER Filed Aug. lO, 1929 vwawboz HARRY G. Naim/00u raaaiea A, so, `ia

nanna e. nenwoon er Bergmann, nanrrann, Assrenoia' 'ro resrrrva roca wasnna coureur, er nirwana, new rnnsn fare nur-toen wasn i application mea august raza. serial no. aegee?.

rlhis invention relates to an improvedtorm ot sprin lock washer, particularly adaptedk for use or heavy work or where high pressures are applied to the washers, such as in railroad work in bolting ties together, and for other heavy duty work, lt is the principal obj ect of my invention to provide a spring lock washer which will give at least spring eects in two distinct waysirst, by the odsetv of the split ends of the washer, and second, due to the shape or crosslsectional form of the washer stock.

Another lobject of my invention is to provide a spring washer which will take a very high pressure and still retain its resilience and abilityto take up for stretch in the bolt.

Another object of my invention is to pro- 'vide a springfwasher which cannot be distorted, by the tension of the nut, beyond its elastic limit` or ability to maintain its spring edect to hold the joint tight.

My invention will be readily understood by. reference to the annexed drawing, wherein:

Figure l shows an assembled view of one form of the washer as it is just being engag by the nut. v

Figure 2 is a plan view of the face of one form of the washer.

- are separated by au annular abutment 3 which in the form shown in Figures 1,4, and 6is substantially in the same plane t as the edges 5 and 6 of the washer.

ln the ormshown in Figures 2 and 3, the

abutment Y3 projects somewhat be ond theplane et the edges 5 and 6, as indicated by the space 7, but in either form, they washer is substantially in the shape of the numeral 3.' lt is to be understood that where the washer is made from drawn or rolled strip stock, this is rolled up, in a spiral manner, as is the usual practice `in the making of lock washers, and cut od as indicated at 8. lt is also to be noted that the stock is provided with a depression or groove 12 opposite the abutment 3, and as will be seen from Figure l, when .pressure is applied to the nut l0 on the bolt 11 to place the washer against the work 9, the pressure tends to spread the edges 5 and 6, thereby putting the washer under tension, and this tension will increase until the depression 12 has been substantially oblit- 'erated The larger amount of the additional pressure applied by the nut 1G, is then taken by the abutment 3; or in other words, the' abutment 3 prevents the additional tension applied to the nut 10 from spreading the edges 5 and 6 beyond the elastic limit of the material, so the washer will maintain its spring eliect, thereby holding lthe joint tight, and at the same time prevent the washer from becoming broken due to the strain applied bythe nut.

In the form shown in Figure 3, the abutment 3 has been shown somewhat sharper than that shown in Figures l and 6. ln this form of washer, the parts 5 and 6 are bent downward or spread about the annular abutment 3 until the edges 5 and 6 engage `the work, when the action becomes substantially the same as in the form shown in Figure l.. The form of washer shown in yFigure 3, is somewhat more resilient and has a greater springeect, than that shown in' Figure '1, but'the claims are intended to cover both forms.

"While l prefer to make the washer from drawn or rolled stock, it may be formed in suitable dies and for some classes or work, the Washer need not be split as shown in the drawing.

Having thus described my invention, what l claim is:

l. A spring nut loclr washer having a 3- shaped transverse cross-section takenon any radius of the washer.

2. Aspring nut lock washer formed spirally and cut to leave a split, the stock hag 1 having a depth' so as to come into enga esubstantially a -shaped cross-section from end to end.

3. A spring nut lock washer having a split and the ends adjacent the split ofset a predetermined amount in opposite directions to give a certain spring effect, said washer having afurther spring ei'ectby reason of its cross-sectional shape which is substantially.

like the numeral 4. A spring nut lock washer having a air of. grooves on one face thereof and an a utment between said grooves, said abutment having a depth so as to come into engagement before the edges formed by the grooves.

5. A s ring nut lock washer vformed spirally an having a pair of spaced grooves on one face with an abutment therebetween, and a recess in the other side of the stock opposite said abutment for the purposes described.

6. A spring nut lock washer having a pair of grooves on one face thereof andan abut mentjbetween said grooves, said abutment ment at least as soon as the edges formed vy the grooves, the material on the nut side of the washer opposite the abutment being removed whereby initial pressure of the nut is applied on opposite sides of the abutment as and for the purposes described.

7 A spring nut lock washer having the material of the washer so formed as to have substantially an annular fulcrum between the inner and outer edges of the washer, and

the materialv opposite the fulcrum removed so pressure by the nut initially tends to stress the materia-labout the fulcrum and finally under high pressure from the nut, the fulcrum limits the stress on lsaid edges for the purpose described.

In testimony whereof, I aix my si ature.

HARRY G. NORW OD.

memos 

